Changing money on the street is illegal – always use a bank.

在街头兑换货币是非法的–始终要去银行。

《柯林斯英汉双解大词典》

It's illegal to drug horses before a race.

比赛前给马服用兴奋剂是违法的。

《牛津词典》

It's illegal to get into a formal agreement with investors that they'll buy in the aftermarket.

与投资人达成正式协议允许其在后市买入是非法的。

《柯林斯英汉双解大词典》

For another,she pretended to be a woman who cleaned houses so she could report about illegal activities in employment agencies.

VOA: special.2010.10.10

It's illegal, so they can't sign that as a contract, but they they can just agree to do it.

因为是违法的,合同也就无效了,不过他们可以私下达成默契

耶鲁公开课 - 博弈论课程节选

He is the secret head of a large illegal gambling ring which use the computer for its operations.

他是一个秘密的，大的，非法的赌博团伙的头,那个团伙用这个电脑来操作。

哈佛公开课 - 计算机科学课程节选

Only in the past few years, with the downturn in the economy, have we seen a drop in illegal entry and a decrease in the size of the illegal immigrant population.

FORBES: Taking a Good Look at the "Red Card Solution"

Tiger Pools has become engulfed in a high-profile corruption case--a reminder why betting is often illegal or a state monopoly in the first place.

FORBES: Magazine Article

He said it could lead to a situation where it would be illegal for a person to grow vegetables of a strain handed down through their family in their garden.

BBC: Planned new European laws 'threaten' rare seeds